"to come to be," now chiefly, if not solely, in the archaic expression woe worth the day, present subjunctive of Old English weorðan "to become, be, to befall," from Proto-Germanic *werthan "to become" (source also of Old Saxon, Old Dutch werthan, Old Norse verða, Old Frisian wertha, Old High German werdan, German werden, Gothic wairþan "to become"), literally "to turn into," from PIE root *wer- (2) "to turn, bend."